Backpack



FIG. 1 is a top, front and side perspective view of a backpack showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view with the cover flap open. 

The ornamental design for a backpack, as shown and described. 